Bicycle Hydraulic Brake Lever With Rolling Piston Actuation
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Solution Overview
Problem
Existing hydraulic brake control devices for bicycles suffer from frictional abrasion between the trigger member and piston rod, poor hand feeling during braking, difficulty in disassembly and maintenance, and interaction between oil filling and exhaust processes.
Innovation Solution
A bicycle hydraulic brake control device with a rolling member connected to the trigger member and piston rod to reduce friction, an adjusting member to accommodate different hand sizes, and separate oil filling and exhaust ports for easy maintenance and smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stationary shaft and brake shaft of the hydraulic cylinder are used in a coaxial structure, then the braking function is achieved, but the structure becomes cumbersome to disassemble or assemble, difficult to repair, and poor in reliability
Solution Approach 1:
The patent divides the shaft system into separate components: a stationary shaft fixed to the control main body and a brake shaft connected to the brake lever. This segmentation allows independent maintenance of each shaft without disassembling the entire hydraulic brake control device, directly resolving the contradiction between reliability and ease of repair.
2Force
If the hammer 40 and piston 27 are in direct contact during braking, then the braking force is transmitted, but frictional sliding causes abrasion on the friction surface and damages the hammer or piston
Solution Approach 1:
The patent introduces a rolling member as an intermediary element between the trigger member and piston rod. The rolling member converts sliding friction into rolling friction, significantly reducing abrasion on the friction surfaces while maintaining the transmission of braking force. This directly addresses the contradiction between transmitting braking force and preventing surface abrasion.
3Device complexity
If the oil filling port and exhaust port in the hydraulic cylinder are combined, then the structure is simplified, but interaction between oil filling and exhaust processes occurs
Solution Approach 1:
The patent separates the oil filling port and exhaust port into distinct locations on the hydraulic cylinder. The oil filling port is positioned for oil storage chamber access, while the exhaust port is positioned for piston chamber exhaust. This spatial segmentation prevents interaction between the two processes, allowing independent operation of oil filling and exhaust functions while maintaining reasonable structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides a smoother braking experience, improved reliability, and ease of assembly and maintenance, while preventing abrasion and reducing frictional forces, ensuring safety and efficiency in braking operations.
Implementation Method 1
a rolling member, the rolling member being used for reducing friction between the trigger member and the piston rod
Implementation Method 2
a liquid with a certain pressure, such as hydraulic oil, is output from the interior of the hydraulic cylinder to press against a brake member arranged on a wheel
Data Source
AI summary
Disclosed are a bicycle hydraulic brake control device and a bicycle. The bicycle hydraulic brake control device includes: a control main body connected to a handlebar of a bicycle; a brake lever pivotally connected to an end of the control main body; a hydraulic cylinder connected to the control main body; a piston rod connected to the hydraulic cylinder; and a trigger member hinged to the control main body, wherein the trigger member includes a pressing portion and a pushing portion. In the brake control device, the piston rod is pushed by means of the rolling member to do a piston motion, so that hard friction between the trigger member and the piston rod is prevented to reduce the friction force between the trigger member and the piston rod and achieve a smooth hand feeling of braking, the braking effect is improved, and a rider's braking experience is also improved.